A network switch detects a DHCP frame on the LAN that appears to have come from a DHCP server that is not located on the local network. In fact, it appears to have originated from outside the organization's firewall.

As a result, the switch drops the DHCP message from that server.

Which security feature was enabled on the switch to accomplish this?

answer

IGMP snooping

Port security

DHCP snooping

Dynamic ARP inspection